16x2 - 128x + 256
= 16(x2 - 8x + 16)
= 16(x - 4)2, or [4(x - 4)]2, or (4x - 16)2
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5x-6+3x+128x-6+128x+6
16x2 - 56x + 49 = (4x - 7)2
y = -16x2 + 342At the x-intercepts, y=0-16x2 + 342 = 016x2 = 342x2 = 342/16 = 21.375x = plus and minus sqrt(21.375) = approx. plus and minus 4.6233 (rounded)
(4x+5)(4x+5)
4(2x + 3y)(2x + 3y)