exam Maths Puzzle Numerical Ability

Multiply. (5a - 3b)^2

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Please help!!!!!

1) Number Problem: Find two consecutive positive integers such that the sum of their squares is 85.

2) 2x^2-5x=3

3) 3x^2-2x+1=0

4)Construction: A gar
Find the missing values that solve this equation.
y = 5 -4x

(5, ____) (1, ____) (-1, ____)


I need the missing points and the steps :)