Question

$441 - p {}^{2} = (21) { }^{2} - (17) { }^{2}$
Find the value of p by solving​

Answer 1

441 − p² = (21)² − (17)²

21² – p² = 21² – 17²

– p² = 21² – 17² – 21²

– p² = – 17²

p² = 17²

p = ± 17

Answer 2

441-p²=(21)²-(17)²

(21)²-p²=(21)²-(17)²

-p²=(21)²-(17)²-(21)²

-p²=-(17)²

p=17