##
1.
Expansion of (x + 3y)(x - y) gives

##
2.
9a² - 4 gives

##
3.
Factorize x² + 8x + 12

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4.
If x=3 is solution of x² + kx + 15, the value of k is

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5.
Expansion of 2x(x + 2y) + 3x(2x - 3y) yields

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6.
The two positive numbers differ by 5 and square of their sum is 169 are

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7.
Factorize 2x²y² + 5xy - 12

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8.
(a + 2b)² - (a + 2b)(3a - 7b) by factorization gives

##
9.
39² + 78 + 1 using algebraic identities gives

##
10.
The whole number such that twice of its square added to itself gives 10

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