Como você resolve x ^ 2 + 2x - 15 = 0 ?
Responda:
x=-5" or "x=3
Explicação:
"the factors of - 15 which sum to + 2 are + 5 and - 3"
rArr(x+5)(x-3)=0
"equate each factor to zero and solve for x"
x+5=0rArrx=-5
x-3=0rArrx=3
x=-5" or "x=3
"the factors of - 15 which sum to + 2 are + 5 and - 3"
rArr(x+5)(x-3)=0
"equate each factor to zero and solve for x"
x+5=0rArrx=-5
x-3=0rArrx=3