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1.

4 + y - 14y²

= 4 + 8y - 7y - 14y²

= 4×1 + 2×4 - 7y×1 - 2y×7y

=4( 1+2y) - 7y(1+2y)

=(4-7y)(1+2y)

=(2y+1)(4-7y)

2.

5 + 3a - 14a²

= 5 + 10a - 7a - 14a²

= 5×1 + 5×2a - 7a×1 - 7a×2a

=5(1+2a) - 7a(1+2a)

= (5-7a)(1+2a)

= (2a+1)(5-7a)

4 + y - 14y²

= 4 + 8y - 7y - 14y²

= 4×1 + 2×4 - 7y×1 - 2y×7y

=4( 1+2y) - 7y(1+2y)

=(4-7y)(1+2y)

=(2y+1)(4-7y)

2.

5 + 3a - 14a²

= 5 + 10a - 7a - 14a²

= 5×1 + 5×2a - 7a×1 - 7a×2a

=5(1+2a) - 7a(1+2a)

= (5-7a)(1+2a)

= (2a+1)(5-7a)

4 + y - 14y²

= 4 + 8y - 7y - 14y²

= 4×1 + 2×4 - 7y×1 - 2y×7y

=4( 1+2y) - 7y(1+2y)

=(4-7y)(1+2y)

=(2y+1)(4-7y)

2.

5 + 3a - 14a²

= 5 + 10a - 7a - 14a²

= 5×1 + 5×2a - 7a×1 - 7a×2a

=5(1+2a) - 7a(1+2a)

= (5-7a)(1+2a)

= (2a+1)(5-7a)