book Maths Puzzle Numerical Ability

my question is on solving equations with variables on both sides

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book Other Question

What is the remainder of-
x^3+5x^2-6x+10(divided by) x+3
hello can you please help me solve this question

it says substitute a= -2 and b= -1 to find the value of the expression

2b squared minus a squared...sorry if how i explained it insnt understandable.

thank you