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Grade 8 - Mathematics
7.51 Polynomials Review Test

Q 1: If (x+1/x) = 9 find x2+1/x2.
69
75
79
89

Q 2: Expand (2x+2y+z)2.
4x2+4y2+z2+8xy+2yz+4xz
None of these
4x2+4y2+z2+8xy+4yz+4xz
4x2+4y2+z2+4xy+4yz+4xz

Q 3: If a+b = 8 and ab = 15, find the value of a3+b3.
152
153
157
159

Q 4: Find the product of (2x+2y+2z) (4x2+4y2+4z2-4xy-4yz-4xz).
None of these
8x3+8y3+z3-12xyz
8x3+8y3-z3-24xyz
8x3+8y3+z3-24xyz

Q 5: Divide [(3a)3 + (3b)3] by (3a+3b).
9a2+9ab+9b2
None of these
9a2-9ab+9b2
9a2-9ab-9b2

Q 6: (2x2-5).(7x+1) = _____?
14x3+2x2-35x+5
14x3-2x2-35x-5
14x3+2x2+35x-5
14x3+2x2-35x-5

Q 7: If a+b+c = 6 and a2+b2+c2 = 20, find the value of ab+bc+ca.
4
8
6
2

Q 8: Expand (5x+2y)2.
25x2+20xy+4y2
25x2-20xy+4y2
25x2+20xy+2y2
None of these

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