Question

(55) = 11
4. If the value of the polynomial x2 - ax + 7 for
x = -1 is 10, then find the value of a. (2 marks)
Solution :​

Answer 1

Answer:

-5

Step-by-step explanation:

x=-1is 10

a=?

x2-ax+7 ........(1)

put value of a=-1 in eqn 1

-1*2-1*x+7=10

-2-x+7=10

5-x=10

-x=10-5

-x=5

x=-5