Notesale: Turn your study into money

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Algebra Basics: What Is Algebra? In this lesson, we learn about algebra, a branch of mathematics that introduces the element of
the unknown
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We also learn how algebra is used in the real world to describe and predict
things
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Symbols are used to represent unknown values in equations, and the goal is to figure out what
the unknown values are
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Algebra is used in fields like
science, engineering, economics, and computer programming
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We learn about equations, variables, and how multiplication is the default
operation in algebra
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Algebra Basics: Solving Basic Equations Part 1 we learn how to solve some simple Algebraic equations that just involve addition and
subtraction
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In the next video, we will learn how we can solve simple equations involving
multiplication and division
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Then
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Whenever we do
something to an equation, we have to do the same thing to [UNK] sides
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And
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TO solve for the unknown value & x & in an [UNK] x + 7 =
15
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Unknown value is on the right hand side of the equation
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WE want to get & x & by itself, but this time &x & is being added to 25
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Thanks to the commutative property, that &s the same as 25 being added
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But
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THe minus 25 cancels out the positive 25 that was there
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SO
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Do
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You switch the order of subtraction,
it &s a different problem
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But
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You just need to get the unknown value all by itself by adding or subtracting
something from both sides of the equation
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And
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Algebra Basics: Solving 2-Step Equations we learned how to solve simple equations that had only one arithmetic operation in them
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To solve equations that have two arithmetic operations in them are going to
require two different steps to solve them
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To undo those two operations, we need to use their inverse operations subtraction
and division
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The best strategy is to apply those order of operations rules in reverse when
solving equations
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Math's order of operations rules say we are
supposed to do operations that are inside of groups first
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So in this problem,
we should start by undoing the multiplication that 's implied between the 2 and the group x + 2
to multiply both sides by 2
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So our answer is x
= 10
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The x 1 on top forms a group and everything on the bottom of the line forms
another group
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On the other side, we have 8 plus 1 which is 9
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Remember to
undo operations using the reverse order of operations rules
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Practice by trying to solve lots of different problems

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