Tick the correct answer-x2-4 x-21-a x-7x-3b x-7x-3c x-7x-3d x-7x-3

(b) (x + 7)(x minus; 3) x2+4x 21=x2+7x 3x 21=x(x+7) 3(x+7)=(x 3)(x+7) ...

Tick the cor...

Question

Tick (✓) the correct answer:
x² + 4x − 21 = ?
(a) (x − 7)(x + 3)
(b) (x + 7)(x − 3)
(c) (x − 7)(x − 3)
(d) (x + 7)(x + 3)

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$x^{2} + 4 x - 21 = ? (a) (x - 7) (x + 3) (b) (x + 7) (x - 3) (c) (x - 7) (x - 3) (d) (x + 7) (x + 3)$

$(x^{2} - 4 x - 21)$ =?

(a) $(x - 7) (x - 3)$

(b) $(x + 7) (x - 3)$

(d) None of these

Tick $(✓)$ the correct answer in each of the following:
$(2 x + 3) (3 x - 1) = ?$

(a) $(6 x^{2} + 8 x - 3)$
(b) $(6 x^{2} + 7 x - 3)$
(c) $6 x^{2} - 7 x - 3$
(d) $(6 x^{2} - 7 x + 3)$

Factorise $2 x^{2} - 7 x + 6$

\int \frac{{sec}^{2} x}{(sec x + tan x)^{9 / 2}} d x