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(1K) Factorising $x^2+bx+c$

Review of Factorizing

Expand $\left(x+1\right)\left(x+2\right)=x^2+$ $x+$
$\quad$ Factorize $x^2+3x+2=\bigl(x+$ $\bigl)\bigl(x+$ $\bigl)$
Expand $\left(x-5\right)\left(x+3\right)=x^2-$ $x-$
$\quad$ Factorize $x^2-2x-15=\bigl(x-$ $\bigl)\bigl(x+$ $\bigl)$
Expand $\left(x-4\right)\left(x-8\right)=x^2-$ $x+$
$\quad$ Factorize $x^2-12x+32=\bigl(x-$ $\bigl)\bigl(x-$ $\bigl)$
Expand $\left(x+7\right)\left(x-2\right)=$
$\quad$ Factorize $x^2+5x-14=$
Expand $\left(x-9\right)\left(x-8\right)=$
$\quad$ Factorize $x^2-17x+72=$

Fully factorize:
$x^2+10x+21$
$x^2-13x+42$

$x^2+x-42$
$x^2-x-12$

Fully factorize:
$x^2+6x-16$
$x^2+15x+56$

$x^2+15x+54$
$x^2+4x-12$

$x^2-x-2$
$x^2+4x-5$

$x^2-2x-8$
$x^2-5x+4$

$x^2-25$
$x^2-16$

$x^2+17x+72$
$x^2-6x+5$

$x^2-11x+18$
$x^2+7x+6$

$x^2-10x+16$
$x^2+3x-18$