Find the product and also find its value if P =1 Q =-1 and r =2 1/2(4q²+5r²) × (4q²-5r²)
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Answer:
StepGiven:(p
2
+q
2
+r
2
)(pq+qr)
Substituting p=2,q=−3 in the above equation, we get
=(2
2
+(−3)
2
+r
2
)(2×−3+(−3)r)
=(4+9+r
2
)(−6−3r)
=−(13+r
2
)(3r+6)
=−(39r+78+3r
3
+6r
2
)
=−(3r
3
+6r
2
+39r+78)-by-step explanation:
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