Question

Find the value of P cube minus Q cube if P minus Q equal to minus 7 and PQ equal to minus 10
class 9 maths polynomials ncert cbse​
will mark as brainlest for th 1st comnt sure

Answer 1

-133

Step-by-step explanation:

P^3-Q^3=(P-Q)(P^2+PQ+Q^2)

GIVEN THAT PQ= -10

AND P-Q= -7

WE KNOW THAT (P-Q)^2=P^2+Q^2-2PQ

ON SUBSTITUTING ALL THESE VALUES

WE GET ANSWER AS (-133)

Answer 2

Answer:

The formula of (a + b)² and (a - b)²

Compute the value of P² + Q²

Compute the value of P + Q

Add the  equations P - Q = -7 and P q=-10

Use the value of P in the  equation P + Q and solve for Q

Compute the value of P³ - Q³

Step-by-step explanation:

p3-Q3=(P-Q)(P2+PQ+Q2)

GIVEN THAT PQ= -10

AND P-Q= -7

WE KNOW THAT (P-Q)2=P2+Q2-2PQ

ON SUBSTITUTING ALL THESE VALUES

WE GET ANSWER AS (-133)