Oblicz: y=1/2(x+5)(x-2) i napisz krok po kroku. poprawna odp.->15pkt.
y=1/2(x+5)(x-2)
y=1/2 - 2x + 5x - 10 (wymnożyliśmy nawiasy)
y=1/2 + 3x - 10
delta = b^2-4ac
delta = 9 +40 = 49
= 7
x1 = -b - /2a = -3 - 7/2*1/2 = -10/1 = -10
x2= -b + /2a = -3 + 7/2*1/2 = 4/1 = 4
jeśli , to
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y=1/2(x+5)(x-2)
y=1/2 - 2x + 5x - 10 (wymnożyliśmy nawiasy)
y=1/2 + 3x - 10
delta = b^2-4ac
delta = 9 +40 = 49
= 7
x1 = -b - /2a = -3 - 7/2*1/2 = -10/1 = -10
x2= -b + /2a = -3 + 7/2*1/2 = 4/1 = 4
jeśli , to