Question

solve using standard identity (x-3)(x+7)​

Answer 1

Answer:

$(x + a)(x + b) = {x}^{2} + (a + b) \times + ab \\ \\ \\ (x - 3)(x + 7) = {x}^{2} + ( - 3+ 7)x + ( - 3) \times 7 \\ \\ \\ = {x}^{2} + 4x - 21$

Answer 2

Answer:

this is answer

${x}^{2} + 4x - 21$