f(x) = 2x + 5 g(x) = x kuadrat + 4x - 10 f(a) = g(a) tentukan a

Question

Matematika Diposting : 2014-11-14 Diupdate : 2023-12-09 fazan

Pertanyaan

f(x) = 2x + 5
g(x) = x kuadrat + 4x - 10
f(a) = g(a)
tentukan a

Answer 1

2a + 5 = a² + 4a - 10
a² + 2a - 15 = 0
(a + 5)(a - 3) = 0
a = - 5 atau a = 3

Answer 2

2a+5=a²+4a-10
a²+4a-2a-10-5=0
a²+2a-15=0
(a-3)(a+5)=0
a=3 atau a=-5