2x2 is 4 and 4x2 is 8. The answer is 8. You could also look at it like 2^3, which is 2x2x2...and there is no need to separate the last 2 from the rest.
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6x3 - x2 + 17 = 2x2 + 47 6x3 - x2 - 2x2 = 47 - 17 x2(6x - 1 - 2) = 30 this is the simplest factorisation.
x2 + 7x = 2x2 + 6 x2 - 2x2 + 7x = 6 -x2 +7x - 6 = 0 or alternatively x2 - 7x + 6 = 0
2x2 + x2 = 3x2
The solution to the problem 2x2 is 4 (the result of multiplication).
2x2 = x2 - 2 Subtract x2 from both sides: x2 = -2 Take square roots: x = + or - i*sqrt(2) where i is the imaginary sqrt of -1.