Question

( 2a+5 )×( 2a-7 )+21=

Answer 1

$(2a + 5)(2a - 7) + 21 = 4a {}^{2} - 14a + 10a - 35 + 21 = 4a {}^{2} - 4a - 14$

Answer 2

(2a+5)×(2a-7)+21=4a^2-14a+10a-35+21=4a^2-4a-14