(5-7i)(4-8i) eching

$$( 5 - 7 i ) ( 4 - 8 i )$$

Baholash

$$-36-68i$$

Yechim qadamlari

Binomlarni ko‘paytirgandek 5-7i va 4-8i murakkab sonlarni ko‘paytiring.

$$5\times 4+5\times \left(-8i\right)-7i\times 4-7\left(-8\right)i^{2}$$

Ta’rifi bo‘yicha, i^{2} – bu -1.

$$5\times 4+5\times \left(-8i\right)-7i\times 4-7\left(-8\right)\left(-1\right)$$

Ko‘paytirishlarni bajaring.

$$20-40i-28i-56$$

Real va mavhum qismlarni birlashtiring.

$$20-56+\left(-40-28\right)i$$

Qo‘shishlarni bajaring.

$$-36-68i$$

Ashyoviy qism

$$-36$$

Yechim qadamlari

Binomlarni ko‘paytirgandek 5-7i va 4-8i murakkab sonlarni ko‘paytiring.

$$Re(5\times 4+5\times \left(-8i\right)-7i\times 4-7\left(-8\right)i^{2})$$

Ta’rifi bo‘yicha, i^{2} – bu -1.

$$Re(5\times 4+5\times \left(-8i\right)-7i\times 4-7\left(-8\right)\left(-1\right))$$

5\times 4+5\times \left(-8i\right)-7i\times 4-7\left(-8\right)\left(-1\right) ichidagi ko‘paytirishlarni bajaring.

$$Re(20-40i-28i-56)$$

20-40i-28i-56 ichida real va mavhum qismlarni birlashtiring.

$$Re(20-56+\left(-40-28\right)i)$$

20-56+\left(-40-28\right)i ichida qo‘shishlarni bajaring.

$$Re(-36-68i)$$

-36-68i ning real qismi – -36.

$$-36$$