Question

${4}^{2} x - 7x = 0$
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Answer 1

X = - (-7) +- V(-7)^2 - 4 • 4 • 0/2 • 4
X = 7 +- V49 - 0/ 8
X = 7 +- 7/8

X1 = 7 - 7/8
X1 = 0/8
X1 = 0

X2 = 7 + 7/8
X2 = 14/8 : 2
X2 = 7/4

S = {0 , 7/4}