book Maths Puzzle Numerical Ability

simplify the following algebraic expression

Multiply: (2s +5z)^2(s + 3z)^2

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book Other Question

how do I solve (a^2+b+2)^2 I need to find the intercept point of y=3x+8 and 4x+2y=6. If you can find the answer, would you explain it to me? I also have a few more to do and I need to understand how to do it.