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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 + 6)(4x - 6)
(4x-8)2 = (4x-8)(4x-8) = 16x2-32x-32x+64 = 16x2-64x+64
Well, darling, 16x2 is 32 and 8x7 is 56. Add those together and you get 88. So, the answer to your question is 88. Math can be a piece of cake when you have a sassy assistant like me!