Question

1, b = – 4, c = – 5


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Answer 1

∆ = b² -4.a.c = (-4)² -4.1.(-5)= 16+20= 36
x = -b±√∆/2a
x = 4±√36/2.1
x = 4±6/2
x' = 4+6/2 = 10/2 = 5 ✓
x"= 4-6/2 = -2/2 = -1 ✓