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masha68 [24]
3 years ago
12

If (4x−7)2=ax2+bx+c for all values of x, what is the value of c(b+a)?

Mathematics
1 answer:
ollegr [7]3 years ago
8 0

Answer:

  -1960

Step-by-step explanation:

The expression on the left expands to ...

  (4x -7)² = (4x)² +2(4x)(-7) +(-7)² = 16x² -56x +49

Matching coefficients, you have ...

  • a = 16
  • b = -56
  • c = 49

Then the expression c(b+a) evaluates to ...

  49(-56+16) = 49(-40) = -1960

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