Book Maths Puzzle Algebra

if the square of a number is subracted from seven times the number, the difference is 12. What is the number?

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Book Other Question

What is the square feet of a triange with sides measuring 207.4 feet, 199.51 feet, and 40 feet? I need to know how to solve a quadratic eq.
y-1=(x-3)^2 I have to find the vertex, x-intercepts, and y-int.
Also the same for x^2+2x-3

thank you!!