Question

(x-9/7)(x+7/9)

Answer 1

x^2-16/63
thats as far as i have gotten

Answer 2

whats (-9/7)(7/9) ?

Answer 3

x^2+(7/9-9/7)x-(-9/7)(7/9)
=x^2 - (32/63)x - 1

Answer 4

Here is the method I was taught to expand brackets

Answer 5

\[(x-\frac{9}{7})(x+\frac{7}{9})=x^2+\frac{7x}{9}-\frac{9x}{7}-\frac{9*7}{7*9}\]
\[=x^2+\frac{49x}{63}-\frac{81x}{63}-1\]
\[=x^2-\frac{32x}{63}-1\]