exam Maths Puzzle Numerical Ability

Multiply the following (4 - square root 7) ( 3 + 2 square root 7)

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exam Other Question

Solve the following quadratic equations by factoring
x^2 -9x - 4 = 6
Multiply and simplify.

-3a^2b/35a^5 x 14a^3b^2/-9b^4

I have come up with 2/15b. Is this correct?