Question

Factorise:
1. a²-10a+21​

Answer 1

Answer:

Find it below

Step-by-step explanation:

a2  −10a+21

                  =a2  −7a−3a+21

                   =a(a−7)−3(a−7)

                    =(a−7)(a−3)

Answer 2

p+q=−10

pq=1\times 21=21

pq=1×21=21

1,−21

-3,-7

−3,−7

−1−21=−22

-3-7=-10

−3−7=−10

p=−7

q=-3

q=−3

(a2 −7a)+(−3a+21)

a(a−7)−3(a−7)

(a−7)(a−3)