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hodyreva [135]
3 years ago
7

Use the method of completing the square to solve x2-8x+7=0

Mathematics
2 answers:
11111nata11111 [884]3 years ago
8 0

A should be your answer no 100 %


musickatia [10]3 years ago
8 0

Solution, solve\:for\:x,\:x^2-8x+7=0\quad :\quad x=7,\:x=1

Steps:

Solve\:with\:the\:quadratic\:formula, \mathrm{For\:}\quad a=1,\:b=-8,\:c=7:\quad x_{1,\:2}=\frac{-\left(-8\right)\pm \sqrt{\left(-8\right)^2-4\cdot \:1\cdot \:7}}{2\cdot \:1},\\

x=\frac{-\left(-8\right)+\sqrt{\left(-8\right)^2-4\cdot \:1\cdot \:7}}{2\cdot \:1}:\quad 7

x=\frac{-\left(-8\right)-\sqrt{\left(-8\right)^2-4\cdot \:1\cdot \:7}}{2\cdot \:1}:\quad 1\mathrm{The\:final\:solutions\:to\:the\:quadratic\:equation\:are:} x=7,\:x=1

The correct answer is <u><em>B.</em></u>

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Answer:

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Step-by-step explanation:

cos 4u = co^s2 2u - sin^2 2u

Let 4u = 2x

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3 years ago
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Answer:  448 dollars

=============================================

Work Shown:

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t = 1 is the number of years

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Add this onto the balance of 400 dollars and the total amount Aaron owes is P+i = 400+48 = 448 dollars.

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