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A = 2
B = -2
C = -4
a dan b adalah akar-akarnya
5a+5b = 5(a+b)
= 5 (-B/A)
= 5(-(-2)/2)
= 5(1)
= 5
maka penyederhanaannya 2()
2(x-2)(x+1)
maka akar persamaan -1 (a) dan 2 (b)
maka nilai 5a + 5b = 5(-1) + 5(2) = -5 +10
nilai 5a + 5b =5
semoga membantu :)
maaf tadi salah hitung