f(x) = 6x³ + 13x² - 4. Use the factor theorem to show that (x+2) is a factor of f(x)
If x+2 is a factor implies x=-2 is a solution
Sub in x=-2 : f(-2) = 6*(-2)³ + 13*(-2)² -4 = 6*-8 +13*4 - 4 = 0
f(-2) = 0 therefore x+2 is a solution
BS
Related Maths GCSE answers
All answers ▸Solve for x, 15x+8 = 53
Factorise: y = x^2 + 5x + 6
What is algebra and why do we use it?
A shopkeeper compares the income from sales of a laptop in March and in April. The price in April was 1/5 more than in March. The number sold in April was 1/4 less than in March. By what fraction does income decrease from March to April?