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MEAP Preparation - Grade 7 Mathematics
2.87 Multiplication - III

Directions: Using the definitions given below, solve the problems given in the questions.
A=3x+2y+7z
B=3x+2y
C=9x+3y+7z
D=2x+7y+3z
Q 1: 2(A-B) = ______ ?
4x-20y-12z
14z
-18x-3y-21z

Q 2: 3(B-C) = ______ ?
-12x-7y-31z-43xy-32zx-52zy
4x-20y-12z
-18x-3y-21z

Q 3: 2(AB) = _______ ?
18x2+8y2+24xy+42zx+28zy
-12x-7y-31z-43xy-32zx-52zy
4x-20y-12z

Q 4: 4(B-D) = ______ ?
4x-20y-12z
-12x-7y-31z-43xy-32zx-52zy
-9x2+12y2-3xy+21zx+14zy

Q 5: D(B-C) = ______ ?
-12x-7y-31z-43xy-32zx-52zy
-12x2-7y2-31z2-43xy-32zx-52zy
-9x2+12y2-3xy+21zx+14zy

Q 6: AB-BC = _______ ?
-9x2+12y2-3xy+21zx+14zy
90x2+48y2+102xy+126zx+84yz
-12x-7y-31z-43xy-32zx-52zy

Q 7: 2AB+2BC = _____ ?
45x2+24y2+51xy+63zx+42zy
90x2+48y2+102xy+126zx+84yz
-12x-7y-31z-43xy-32zx-52zy

Q 8: AB+BC = _______ ?
45x2+24y2+51xy+63zx+42zy
90x2+48y2+102xy+126zx+84yz
-12x-7y-31z-43xy-32zx-52zy

Question 9: This question is available to subscribers only!

Question 10: This question is available to subscribers only!


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