find the value of the following expressions :
please answer this question
Attachments:
Answers
Answered by
0
Answer:
Q3)
(a) (x+y)²-(x-y)²
=(1/3+1/5)²-(1/3-1/5)²
=(8/15)²-(-2/15)²
=64/225-4/225=60/255=12/51
(b) (p²-q)²-(p+q)(p-q)
(2²-(-2)²-(2-2)(2+2)
=4-4-0
=0
(c) 3xy+4yz+4zx-x²-y²-z²
=3(2)(3)+4(3)(-2)+4(-2)(2)-(2)²-(3)²-(-2)²
=18-24-16-4-9-4
=-6-16-13-4
=-10-29
=-39
(d) pq-q²+r²
=(1)(2)-(2)²+(-3)²
=2-4+9
=-2+9=7
Similar questions