add 7x^2 - 4x +5 , 3x^2 + 2x -1 and 5x^2 - x +9
Answers
Answer:
Simplifying
4X + 9 = 5X + -15 + 7X
Reorder the terms:
9 + 4X = 5X + -15 + 7X
Reorder the terms:
9 + 4X = -15 + 5X + 7X
Combine like terms: 5X + 7X = 12X
9 + 4X = -15 + 12X
Solving
9 + 4X = -15 + 12X
Solving for variable 'X'.
Move all terms containing X to the left, all other terms to the right.
Add '-12X' to each side of the equation.
9 + 4X + -12X = -15 + 12X + -12X
Combine like terms: 4X + -12X = -8X
9 + -8X = -15 + 12X + -12X
Combine like terms: 12X + -12X = 0
9 + -8X = -15 + 0
9 + -8X = -15
Add '-9' to each side of the equation.
9 + -9 + -8X = -15 + -9
Combine like terms: 9 + -9 = 0
0 + -8X = -15 + -9
-8X = -15 + -9
Combine like terms: -15 + -9 = -24
-8X = -24
Divide each side by '-8'.
X = 3
Simplifying
X = 3
Step-by-step explanation:
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