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Answers
Answer:
Simplifying
2x + 5x + -7 = 0
Reorder the terms:
-7 + 2x + 5x = 0
Combine like terms: 2x + 5x = 7x
-7 + 7x = 0
Solving
-7 + 7x = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '7' to each side of the equation.
-7 + 7 + 7x = 0 + 7
Combine like terms: -7 + 7 = 0
0 + 7x = 0 + 7
7x = 0 + 7
Combine like terms: 0 + 7 = 7
7x = 7
Divide each side by '7'.
x = 1
Simplifying
x = 1
Step-by-step explanation:
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Answer:
= 2x² + 5x - 7
= 2x² - 2x +7x - 7
= 2x(x-1) + 7(x-1)
= (x-1) (2x+7)
x=1 or x= -7/2
2x² + 5x - 7
put x= 1
therefore, 2(1)² + 5(1) - 7
2 + 5 -7
7-7
0
put x= -7/2
therefore, 2(-7/2)² + 5(-7/2) - 7
2(49/4) -35/2 -7
(49 -35 -14)/2
0/2
0