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zimovet [89]
3 years ago
6

Given the function f(x) =-2x^2 + 4x -7 find f(-4)

Mathematics
1 answer:
Kamila [148]3 years ago
4 0
Correct the answer is -55
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To Rationalize the denominator of 5-√7/9-√14, you should multiply the expression by which fractions?
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<u>Answer</u>

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<u>Explanation</u>

To Rationalize the denominator of 5-√7/9-√14.

To rationalize this we multiply both the denominator and denominator by the conjugate of the denominator.

The denominator is 9-√14 and its conjugate is (9+√14).

(5-√7)/(9-√14) = (5-√7)(9+√14)/(9-√14)(9+√14)

                        =  (5-√7)(9+√14)/(9²-14)

                       = (45 + 5√14 - 9√7 - √98)/(81-14)

                        =  (45 + 5√14 - 9√7 - √98)/67

                        = (45 + 5√14 - 9√7 - 7√2)67

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