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Label the two equations.
x2 + 8x + y2 = 84 (1) x - y = 10 (2)
Rearrange (2) to get y = x - 10 and substitute for y in (1) to get x2 + 8x + (x - 10)LTAnswered by Lewis T. • Maths tutor5172 Views
Factorise the quadratic by finding two numbers that add to make -7 and multiply to make 10. (i.e. -2 and -5). So x^2 - 7x + 10 = (x - 2)(x - 5) </= 0. Sketch the quadratic to see where it is negativ...
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