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Answer:
Step-by-step explanation:
<u>Completing the square</u>
- x^2 - 8x + 7 = 0
- x^2 - 2*4x + 16 - 9 = 0
<u>The blanks are</u>
Step-by-step explanation:
factor 4 out of the variable terms, as this helps.
but my approach is simply to define the target and then calculate "backwards".
we want to find
(ax + b)² = a²x² + 2abx + b²
and now we compare with the original equation :
a²x² = 4x²
a² = 4
a = 2
2abx = 16x
2×2×bx = 16x
4b = 16
b = 4
b² = 16, but we have only 3, so we need to subtract 16-3 = 13 from the completed square.
so, our equation is
(2x + 4)² - 13 = 0
(2x + 4)² = 13
2x + 4 = sqrt(13)
2x = sqrt(13) - 4
x = sqrt(13)/2 - 2
Answer:
CD=7
Step-by-step explanation:
BAC angle=CED angle (alternate angles are equal)
therfore;
CB=CD(equal angle opposite sides are equal)
You add all of it up and divide by how many numbers are.... so the answer would be D- 56
