No3
1) (2x)²+5²=(2x+5i)(2x-5i)
2) a² + (2sqrt3)²=(a+i2sqrt3)(a-i2sqrt3))
3l (sqrt⁴5)²+3²=(sqrt⁴5+3i)(sqrt⁴5-3i)
No4
1) 7+2i+1-3i=8-i
2) 4+2i-3+i=1+3i
3) 6-12i+5i-10i²=6-7i+10=16-7i
4) (2-3i)/(4-5i)/(4+5i)(4-5i)=(-7-22i)/(21)
No3
1) (2x)²+5²=(2x+5i)(2x-5i)
2) a² + (2sqrt3)²=(a+i2sqrt3)(a-i2sqrt3))
3l (sqrt⁴5)²+3²=(sqrt⁴5+3i)(sqrt⁴5-3i)
No4
1) 7+2i+1-3i=8-i
2) 4+2i-3+i=1+3i
3) 6-12i+5i-10i²=6-7i+10=16-7i
4) (2-3i)/(4-5i)/(4+5i)(4-5i)=(-7-22i)/(21)