Question

factorize: 21x²-23-20​

Answer 1

here is answer

.

${21x}^{2} - 23 - 20 \\ {21x - 43}^{2}$

but if you need factorization the question should be like this.

.${21x}^{2} -23x - 20$

according to that here is answer:

${21x}^{2} - 23x - 20 \\ {21x}^{2} - 35x + 12x - 20 \\ ( {21x}^{2} - 35x) + (12x - 20) \\ 7x(3x - 5) + 4(3x - 5) \\ (3x - 5)(7x + 4)$