What error did Penelope make in her work?
x = –2 or x = [___]
-8
–32 + [___] = 2(x2 + 10x + 25)
50
± [___] = x + 5
3
Add 4Add 16Subtract 4Subtract 16
add 4 to 5 add 24 to 5 subtract 4 from 5 subtract 24 from 5
–2–125
Subtract 25/2Add 25/2Subtract 25/4Add 25/4
subtract 25/2add 25/2subtract 25/4add 25/4
–5/2–11/25/211/2
Complete the steps in solving the quadratic function 7x – 9 = 7x2 – 49x by completing the square.
–9 + [___] = 7(x2 – 8x + [___] )
112
–2–1 12
Which are steps that could be used to solve 0 = 9(x2 + 6x) – 18 by completing the square? Check all that apply.18 + 81 = 9(x2 + 6x + 9)18 + 9 = 9(x2 + 6x + 9)18 + 36 = 9(x2 + 6x + 36)11 = (x + 3)2 StartRoot 342 EndRoot = (x + 6)2 StartRoot 99 EndRoot = (x + 3)2
Which are steps in the process of completing the square used to solve the equation 3 – 4x = 5x2 – 14x? Check all that apply.3 = 5(x2 + 2x)3 = 5x2 – 10x4 = 5(x2 – 2x + 1)8 = 5(x2 – 2x + 1)3 = 5(x – 1)24 = 5(x – 1)2 StartFraction 8 Over 5 EndFraction = (x – 1)2
What are the zeros of the quadratic function f(x) = 6x2 – 24x + 1?
–9 = 7x2 – [___] x
56
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