solve -7p^+24p+16=0 by quadratic formula
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Quadratic formula
x = - b +- √b^2 - 4.a.c / 2a
a = -7 , b = 24 , c = 16
= -(-7) +- √ (24)^2 - 4* -7*16 / 2*-7
= 7 +- √ 576 - 448 / -14
= 7 +- √128 / -4
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