Answer:
x (x + 16) = -64
= x.x + x.16 = -64
= x² + 16x = -64
= x² + 16x + 64 = 0 ( Rumus )
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<u>A</u><u>B</u><u>C</u><u> </u><u>F</u><u>O</u><u>R</u><u>M</u><u>U</u><u>L</u><u>A</u>
the roots of the quadratic equation are -8
<u>or use this Method:</u>
<u>Method FACTORING</u>
x² + 16x + 64 = 0
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(a = 1)
(b = 16)
(c = 64)
(a × c = 64)
... × ... = a×c = 64 | 8 × 8 = 64
.... + .... = b = 16 | 8 + 8 = 16
= 8
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Subtitution value 8:
(x + ....) (x + ....) = 0
(x + 8) (x + 8) = 0
x + 8 = 0
x = 0 - 8
x = -8
the roots of the quadratic equation are -8
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