16x2 - 56x + 49 = (4x - 7)2
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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)
7(x - 1)(x + 3)
(4x+5)(4x+5)
4(2x + 3y)(2x + 3y)
(4x + 5)(4x + 5)