Answer:
2(x - 7)(x + 7)
Explanation:
given
2x² - 98 ← factor out 2 from each term in the expression
= 2(x² - 49) ← x² - 49 is a difference of squares and factors in general as
a² - b² = (a - b)(a + b) , then
x² - 49
= x² - 7²
= (x - 7)(x + 7)
2x² - 98 = 2(x - 7)(x + 7) ← in factorised form