exam Maths Puzzle Numerical Ability

The larger of two supplementary angles exceeds seven times the smaller by four degrees. FInd the measure of the larger angle

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How do you COMPLETELY FACTOR: x^2 + 10x + 21? whats the factored answer? I am severely stuck getting my head around this one. The question says: Find the base number. It then goes on to say: Solar panels provide 65% of the heating for a certain building