Question

Dada a função quadrática f(x)= -5x^2 + 6x +1, determine f(raíz de 2)

Answer 1

f(x) = -5x² + 6x + 1

f(√2) = ?
f(√2) = -5(√2)² + 6(√2) + 1
f(√2) = -5*2 + 6√2 + 1
f(√2) = -10 + 6√2 + 1
f(√2) = 6√2 - 9

Answer 2

f(√2) = -5.(√2)^2+6√2+1 = -5.2+6√2+1 = -10+6√2+1 = +6√2-10+1 = +6√2-9